AliyunMqttArduino: Change Log

v0.2.0 (Feb. 14th, 2019)

Add two new APIs to support calculate HMAC256 externally for resource limited device like Arduino UNO.
Update README.
Add UNO example.

v0.1.1 (Jan. 2019)

Include examples code in library release.
Add changelog file.

v0.1.0

Initial release to PIO registry and validated with Node MCU v3.